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|Given to you by a scientist in the Cinnabar Island Pokémon Lab after showing him a Latios.
Once you collect all eight gym badges and start heading towards Route 23 from Viridian City to challenge the Elite Four, one of Oak’s assistants will stop you and tell you that legendary Pokémon are roaming the wild all over Kanto. This is the initial point when you can start finding Latios.
By opening the map, you’ll see the location of several legendary Pokémon.
When you’re on the same route as a legendary Pokémon, you can encounter it by walking in the wild grass.
So to get this mega stone you’ll need to track down Latios and catch it.
After catching Latios, enter the Pokémon Lab to the left of the Cinnabar Island Pokémon Center.
Head right and enter the room in the far right corner of the hallway.
Speak with the scientist standing directly in front of you.
When prompted to, show him the Latios on your team and he’ll give you the Latiosite.